lens lens /ˈlɛnz/

noun

1. () A transparent optical device used to converge or diverge transmitted light and to form images  ( lens system , lense [Non-standard] , lens )
   a transparent optical device used to converge or diverge transmitted light and to form images
    My optician recommended me to get a new pair of glasses with high-index lenses to reduce the thickness and weight of the lenses
   My optician recommended me to get a new pair of glasses with high-index lenses to reduce the thickness and weight of the lenses
   
   
2. Electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons  ( electron lens , lens )
   electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons
   
3. Biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focus light on the retina  ( crystalline lens , lens , lens of the eye )
   biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focus light on the retina
    The lens of the eye helps to focus light onto the retina
   The lens of the eye helps to focus light onto the retina
   
4. (metaphor) a channel through which something can be seen or understood  ( lens )
   (metaphor) a channel through which something can be seen or understood
    The writer is the lens through which history can be seen
   the writer is the lens through which history can be seen
   

 Lens

1. Genus of small erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and small flattened pods: lentils  ( genus Lens , Lens )
   genus of small erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and small flattened pods: lentils